I am 51 years old, with a correction of -6.0 and am considering Intralasik. I would be interested in feedback from anyone of a similar age regarding the longevity of the improvement brought about by Intralasik.

I think that I am too old, but am not sure that I would want to trust the opinion of someone whose job is to sell Intralasik.

You're never too old for LASIK - just look at the touch-ups being performed for post-cataract patients with IOLs. You'll surely get good distance vision - but your readers will remain.
There are workaround -e.g. monovision- but they're really only a compromise.

You need to consider what we call "Sudden Presbyopia" if you are considering Lasik to provide full distance correction. Monovision Lasik is a workaround that is acceptable to some, and you can try monovision with contact lenses to see if it will work for you.